You can see the difference between the 2 polishes on above picture very well, they are absolutely no dupes.. On my index and ringfinger is Eyeko - Vintage Polish, and my middlefinger and pinkie is Catrice - Sold Out Forever. I used 3 thin coats by both polishes.

And now the colours! As you can see Sold Out Forever is way more green than Vintage Polish. Vintage polish has a blue undertone, while Sold Out Forever got a green undertone. Sold Out Forever is a mint green, and Vintage Polish a jade green. Too bad, these aren't dupes, but I can recommend you both polishes!